A measurement of the tau Michel parameters at SLD

Thesis/Dissertation · Thu May 01 04:00:00 EDT 1997

DOI:https://doi.org/10.2172/515578· OSTI ID:515578

Quigley, James A. ^[1]

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1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

This thesis presents a measurement of the tau Michel parameters. This measurement utilizes the highly polarized SLC electron beam to extract these quantities directly from the measured tau decay spectra using the 1993--95 SLD sample of 4,528 tau pair events. The results are ρ^e = 0.71 ± 0.14 ± 0.05, ζ^e = 1.16 ± 0.52 ± 0.06, and (ζδ)^e = 0.85 ± 0.43 ± 0.08 for tau decays to electrons and ρ^μ = 0.54 ± 0.28 ^μ 0.14, η^μ = -0.59 ± 0.82 ± 0.45, ζsup>μ = 0.75 ± 0.50 ± 0.14, and (ζδ)^μ = 0.82 ± 0.32 ± 0.07 for tau decays to muons. Combining all leptonic tau decays gives ρ = 0.72 ± 0.09 ± 0.03, ζ = 1.05 ± 0.35 ± 0.04, and ζδ = 0.88 ± 0.27 ± 0.04. These results agree well with the current world average and the Standard Model.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 515578
• Report Number(s): SLAC-R--506; ON: DE97008277
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRONS
LEPTONIC DECAY
MUONS
PARTICLE PRODUCTION
STANDARD MODEL
STANFORD LINEAR COLLIDER DETECTOR
TAU PARTICLES
Z NEUTRAL BOSONS